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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287a8fddb6b7675eb6a3fdd41226ce9fde651e1900e47fb03ef0d99bf6e98139' 
  AND token = '9rq5bMHwfV1LWxr+309M01VEizAqs747dzGrOJf+vYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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