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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9e17d74cb188d332f6847aa920d5d11e692eaf09d98169caa0f63ff6e235fa' 
  AND token = 'TP/CCo3p7PhhtgRb1mfEQKLTwTH+MU3UzDHksnlHTBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00180

JSON explain

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