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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb7684b382e95d4dfd7f3426e82761b5f6432da691a4e83b3762659c1723d23' 
  AND token = 'SvfHSGQaNCEfdAo8gYeHt5DIsoUoGcE0vZnZ2ERS8io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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