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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9ed8117aaa493800e9d3d8a3ccd0b9e897c590fd88dd60cd64068243b4f48b' 
  AND token = 'h+OCYvQhIMmb6xHw5OEMWAC7acFn0a3GrK70HbzZ3s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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