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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a7826a8dbd7321d2c0945c0b7e5bfcd987c5bc7424c9e96ee5fb2fd8e87919' 
  AND token = '+0cbx9lj5l5NqAj23ZpHPr9Z1Nmqso2wI+71UfFtXW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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