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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd87904e877831ae89bcb7dbf3a5e665f6a8554d64702cc942c5ecf8dd980296' 
  AND token = 'KOAhLUKCzdtWVU+MgsTd50tiZuc31qPd6E831To9iV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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