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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9832994cdd5fc034d761981b82950fde1eccd3d234f8541486f37a63e419ac' 
  AND token = 'buLK9egrn2u7bEURkQzTHbfds90zXSxUkHCkrNC3FW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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