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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c747d6e4ea951a2174e74efaa5c909fd38c77735ae98deac996173d7ce41abcb' 
  AND token = 'WAatewIPVA3/oNwYJRzIofwjmSx9KDxFYDC1be4Gsp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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