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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ac4c91d3ff497333a95963e5fd7dad2866de417098ddeed6ca0ba2a2550aee' 
  AND token = '7gb6CTCfjx7PKRurZDPKKkZ8h0H6faFnXwKT+3+Jj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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