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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684bf502e1d2d13a43f69cd36d3feff0bd64a6626c53cc51c439bba439455a8c' 
  AND token = 'm94LMzMnVQTuIMPgLgS9UrdNEEzA9OSVgXP2kXGnwg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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