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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5f1bde374468f486aeef80812edbde84c4a77ed6492708bc1820556b82ac2d' 
  AND token = 'LEjA+t65+wKbci2JomIQEqOsMvBSldO2olvYaTC/u88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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