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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2ba468fc5210938bac0e4bcdde55d7459db4dd42276188ae4c8a0f8dab6417' 
  AND token = 'ofRgMiIoH9uAUWSx2AdXgrbQcNp4QaiBj/OCVBUirl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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