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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de55644bc3e1038c2af0922bda979c6973b14620fc2cdcc5d30423bc76e6030c' 
  AND token = '57mhDniJQmcn/JJQ1S7E7Ka0f4k6Wiww7MOWaiIdTBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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