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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c6b0ad51bcbdbb4e6fe283bffb037c941fcafe6eaa889d34f6a6bdd96e9b22' 
  AND token = '6dZxKkLDVuEQajhU50ZgqMJhwybC/KYnb9hnVcepHCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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