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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b3554ae74e29a62f3a55c6d08dbf24b664dacb5d8ab9d3c1a1547eb5396392' 
  AND token = 'S9Lt47ucB6hZR4YHNmIbHgaciRCVMuk2ydL3q53WhlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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