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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3484cb4a4a26501e9a089cec754ea749cb699884faff7d3569ba50755fd49f' 
  AND token = 'orSRLwfOUSIGVB7vOb0jMI7WLCdf/BMOFyjB3RZA7kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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