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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabd8105154f7d47ec091d1da7167a78b65d02fab4544a806bf67b6de578d195' 
  AND token = 'fVnpBzgmmZIiM+1xnsEVZ5YrKo9wwYtt334sPfVIbOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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