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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796771cc469638a783df6d99bc2eb11caa938034b59625959dbaf64db2493c23' 
  AND token = 'seVJrtDruzx8FqoUyDQizsXnirBIINLx/5rXY0e6ywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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