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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5822a61e05377a2eecbc0debd4f254e88c352bd001b565538f632a85162018d1' 
  AND token = 'fmzfKvqgkv+KMJhzXnTCyazN2pIBeU6O3f39jLZWOD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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