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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981b45a23c7c72c4bd2d284b2172cc3dd98f0b3bbd49a16ebad415f3d539a8dd' 
  AND token = 'CD09k5Avbr1fW7U3h6UC9s3oSg0S9Cv9u+taOprJuXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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