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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54973d23284702f2e64adbf460071ffbc4aab122781cc14ceb6739e2a90fee6' 
  AND token = '1oHlwPTWMJuBOQJ72beUEkEoO0r+Q9Kk5rTKXQh+JXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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