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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549c2bac9d6d2feb5cf2c9cd56d7c53750f1cc630b378e38388745234d14a5a5' 
  AND token = 'XOFhwMI7ruLRJm7opldh4ezmwZ/YMYd5EUZaWC7gdms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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