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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a58855b46b1d0dd0dbc438d20b2de5693d81a798f2d9451436ff7dc3d525342' 
  AND token = 'ukp+lb3exTfAyFQX2yi+RYktvUZToMY9UPQPRt8WTiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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