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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e826f8a4f27e7cfc892cfd328439e763c08da03d70504faf43f4a3e558ae15' 
  AND token = 'DAJT05U8AYnwqAaBfraoC1TWoFOdvsuSo1t88iQfKNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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