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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47a4c94b7fcec8bd3b92734db5683b5fb03a66343cca8ed49401cc66bb30d00' 
  AND token = 'ZrX1D3t/D4+F2tapWil+5qpaKQxa74U5pBWxn5imWu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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