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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af1d9b50c7c779dc9b54e7e026040f68777ba370a2a6de70bd7357e916f73f8' 
  AND token = 'wNlUWiB7fDQD1ZM9vqtQiK8e4WrGnN/VPszZRp4lCyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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