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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a67366f938a58a06b5ed39ba8517c9f07f072b35aebb9e60c166191b9260f9' 
  AND token = 'vdp7ZmXkWXI9ABe5jLndiZsmGeYbyX8sDhREZRtLwwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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