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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644c67a866597fd6c8a1125f07fe8ee010eee94d879d40c394109d7ab38de7de' 
  AND token = 'lpP1GIHa1HnKjAz9XHXC5THtvtTsUtXYCcuyyTYXYV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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