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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31306744ab05bd980dfa14a810e04920772f1c75e6656e4e91bf99f5ce6c084' 
  AND token = '/axCt2/6gy6T5i5Af76oZaRdcXwHgiaTNdG+fSHA2Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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