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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93378ac7637a4078bb41ab3e81277691c4a1b4c85884933287db0988213fe1b' 
  AND token = 'rRiYea5G7vDJK8ZwbHV1Skg12SeEXnwx0h21G3Xw3lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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