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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f0f0a5b62794038b04e41cc0a0a884e23393ae1b11eb23128a2b49471734bb' 
  AND token = '1Rs8kh35v7XLWweAB3Os+OiwR1/3+enRXZLqrIsgyBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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