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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af98aa7ab69169ffd186ae5d6db38444c2dfc9d72488f48b0b28af0e7497ba7e' 
  AND token = 'SIakqF1ABcNvAA9u6F2oyhcQxSnlhRL6T99K098N8Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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