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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2950c818169935d0cb2f3ba341e33d765086ebfb58c52d9855238615950f8f' 
  AND token = 'ip0d8BzrKFN0y+/3Gbl06ol8pKRSKz8bFQ2i396qeuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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