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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da6b67f24f57a9720b58e797961548bc30c7c3f7077e3f4835d44f8abeace9b' 
  AND token = 'WeUSF9pX46kmqFOLh8FD7qtgLB7hF6RL+0jHSRlbnOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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