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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c30e702abb8bb05070fa5681e68cc03e9be17b023cb661a3819c95a681e3a9' 
  AND token = '0ufc6utZuuuq1ugPJVU5GL72mxK3KuvPC1RSUNxycAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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