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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b6b24ea01ddec75666b7aff308b0b6b6e911f5766f8a8ff6963f52d33a5a80' 
  AND token = 'XFStrMQVYwnRMncCLtDpEUjqP4YIyHVBYCvJ0nhab2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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