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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04155186884d76ba9af689e9220433643c0a7f61727076ddd30d6e3c4c55a78' 
  AND token = 'h6Txkxhc/ec+M20U7wx82G9fJ/I86BOmi5e8wc5A2Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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