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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285389f231960d49f3bb12087fb238394308e4de4d4ad267a141e407179891d7' 
  AND token = 'VFhysgPx1+FRquSHSZpDGIzn2cAA5M77RbkafEei14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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