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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9418304e519a990232b835fbf359bd4ba81aa0a4c6f51ac36358389b61ba5318' 
  AND token = 'jgsucKXnkWSDPTii6J3s2PcYkngNM9uSpJQK6DyCnrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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