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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c16699f5336715c87876a9dbf3c41aa8837b3cd464283dfdba8e87e8f4e725' 
  AND token = '68jb56A9hLFAIo0/Yl0c/a0+4AqTxG+KvaUs4noNfno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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