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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f68e50e12d1e666b14801b1cbf2a13a40292e4874c0e49826c45fced03e7c14' 
  AND token = 'Xz5NT6lZ5iGiELgHVIIezdf6AvaxZj2R082FKD2I6O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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