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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b5ea89f98f1158f68e900862945b587c58e294e7274bd08651e85c3c8080fc' 
  AND token = 'zotwNdJXdEK79uuqiTYeT7wQy1B+eNH/I1hXz1JXUC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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