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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340f8533f5e6472721e5bb5bc5f395c8751eb1d35bdc649f3b00ea044d7a17d1' 
  AND token = 'MTHAy45tfULG6N/UJxHdSoSkWU98i5wCa5aH7ei2IGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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