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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a676047239d9b8992cc9ea1fd47ae83a1ff3272bbe33a5e896babfa53c802867' 
  AND token = 'Xo2+Ulg1B/rEucpt+skTEMzMTfxyKHjJPPQlin35XK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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