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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52938d2df38c775fbd4caeee30e7a072131ebc14ef11414453e15c6dfb8602b6' 
  AND token = 'BELkdeg6cFUpvLRQoXwUxfgZLJUrrpxDPx0t9kS62r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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