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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af054bc75f67d8c62c613bf826aba5620c0088acb60c8d1d85c1d691fb19928a' 
  AND token = 'uSo4OKMHQKaq+B9MUsf9IIOMj21Qv9IWUyIPTS94Y7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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