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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ad63d7f1c2f119cc0daea5cfa4d5f9d37bacaad00fc13850e849a736c97da3' 
  AND token = 'aQVgyZOEyPR/WhAl3BzjICoQjU9/X+bohj02KiJT5GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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