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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77d6aadb2440bae6a2069bb2602cf4969a60b3503e89e3f1306466b02445241' 
  AND token = '7ZT95uZlY3dQ689wLHzfzfzrjWH7tFozm/wIqo9bzvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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