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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dce7b494f79560a9f77d6b6f4cb1bea94c5f7e01ffd3c93369780dc3e010fbb' 
  AND token = 'fOwRIpKDiQgK4HinbPatZfZDLrmYP9E0Rmp2XnFUrn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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