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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826b91f6d7c3641cd0c02cf17ba50cb8b7faaa99876941a966e12f0209c1c84d' 
  AND token = 'rGJydeXR+W7PLHdI2BKbv1j40RBM2HmmT7v556i/1XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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