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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e862616fd1e8f4651538b2ec593e76fcc93e52ee527b67ba6f4964ae267ba48' 
  AND token = 'N4CbGyOfXoNVLFkrYvrbq9VI7r7c/FMsS2n7mWeYpGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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