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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeadb24a0ac39d4697b9a00f1d5e9ddd4496c53ef59d69793cd3ab69a3156b1d' 
  AND token = 'fK4l0/ZKQ9nSVRjVHRQRI77q20LHvmSOek7hDRbuhjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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