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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a0ced24945df3d728a54f7503f234de258572d386478e776901d61a75a4cfe' 
  AND token = 'WSpnfSfCJLuuzo00lPB+26jM/6V5Fro717TRnhW4h8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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