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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd5ee2f4f2a89eb57805545beaedac37b31ca875d92227f60b61d829e6790bf' 
  AND token = 'DDRruiQ6kJnRG6qKle1NDIDM0fnvob2QHTAOtggb7o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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