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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f95d6efeb1fdec0ab6e8c289047c45b38a981c0c30701b12d7a509e603eb652' 
  AND token = '7KJzfiKOcfxvBch0CPNsKvuaJtl8Zp4eTbaJHe6PbGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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