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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f1d314d83c9751896ee28f1602e243a1f450bc4ec26cb125014d635a408877' 
  AND token = '92Sf/r0o17UWUL8jMr/LxJpb0Ju3YKNZdjYqMiiwhI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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