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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09a11bea9f87f62f0724e004a711b6eaa42ab70133c1e8e14113ca0e17d0b80' 
  AND token = '9+3OJ5qGkhc0SXboYhAfJlUPjlONd3qCyVUb72NUSnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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