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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba77b70d9b81d9c676aed00fc2789bd6119c8ca47ac38beade6ab0f87bd8bb8f' 
  AND token = 'EVMoNZxSEMangS7/caGnERH/5nF9SV00NK+DEyslsIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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