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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3eb63b9e91277000fad3b1863331775829099d61a9cd98cf6e9065652eb6dd' 
  AND token = '4Wvk2HQeJRpCqrTLs1BKBrq2OEm1rEnV26LzZ6v2cFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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