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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cdca01a73f84c9333d0a11072a4ba8ec2b6e8f2dd19e7ea32eb93161ba7af7' 
  AND token = '8k3VJpfqnW+Cqey6GiOTFJRjBL+55h+8ikPukKheWCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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