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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f7691a0846f80ac84c256c1655e705523a3ec907ae0dcedf50389dfa4cc35' 
  AND token = 'H1WHauegd1kF41X0uR2QECI6Pa7qfBkCWnXhzVn8oYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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