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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3118e721ae2f7f475f57a01a49a2cc8e794ec682285c6c76622f55555bbafcb4' 
  AND token = 'owBdarNf6p1ufMCLRLLxOpoDSDrgoxUyQK46iwYP2Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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