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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafba1459377ef328d94e7a992e7483b3e01f5bf85c5f9c90810c0980baa6611' 
  AND token = 'emAvkLLgxHN0GT8gvaTXoj3sxXvH9kgW4jYcEpv670k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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