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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3970642f291fa1bd965acc7d539a91189b83164a9ac9ee8853b392a6e9c35a85' 
  AND token = '2z2XxRd3oTa6nhsbgixhrPPqgee3gztUfBW2lr2abrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}