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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8423065c46626cec3fc92474e6434f4d03c8a6f3279bcdf3c4494ef6c0fba3c4' 
  AND token = 'TGBZ095c4ZYu5srHxRRJz7EknWne6uRlqAvLiqreivY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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