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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e61cd0776de606797e5eeaa5442fd8270d634a78a65553dbd8c75996e69d7e5' 
  AND token = 'E2/WczL4m5nNCbRr9XAJtJ0mtdNHzLX23UqCqHZJwl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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